lib/libc/arch/powerpc/sys/sbrk.S

   1 /*      $NetBSD: sbrk.S,v 1.8 2000/06/26 06:25:44 kleink Exp $  */
   2
   3 #include "SYS.h"
   4
   5         .globl  _C_LABEL(__curbrk)
   6         .globl  _C_LABEL(_end)
   7
   8 #ifdef WEAK_ALIAS
   9 WEAK_ALIAS(sbrk, _sbrk)
  10 #endif
  11
  12         .data
  13 _C_LABEL(__curbrk):
  14         .long   _C_LABEL(_end)
  15         .text
  16
  17 ENTRY(_sbrk)
  18 #ifdef PIC
  19         mflr    %r10
  20         bl      _GLOBAL_OFFSET_TABLE_@local-4
  21         mflr    %r5
  22         mtlr    %r10
  23         lwz     %r5,_C_LABEL(__curbrk)@got(%r5)
  24         lwz     %r6,0(%r5)
  25 #else
  26         lis     %r5,_C_LABEL(__curbrk)@ha
  27         lwz     %r6,_C_LABEL(__curbrk)@l(%r5)   # r6 = old break
  28 #endif
  29         add     %r3,%r3,%r6
  30         mr      %r7,%r3                         # r7 = new break
  31         li      %r0,SYS_break
  32         sc                                      # break(new_break)
  33         bso     1f
  34         mr      %r3,%r6                         # set return value
  35 #ifdef PIC
  36         stw     %r7,0(%r5)
  37 #else
  38         stw     %r7,_C_LABEL(__curbrk)@l(%r5)   # record new break
  39 #endif
  40         blr
  41 1:
  42         b       PIC_PLT(_C_LABEL(__cerror))